Method of cutting keys.



C. L. SMITH.

METHOD 0F CUTTING KEYS.

APPLICATION FILED 001.16.1916.

LQMAM. Patented Jan. 22, 1918.

2 SHEETS-SHEET l.

C. L. SMF-H3 'METHOD or 'cuTTlNG KEYS.

APPLICiATlHO'N FILED,OCT.1 6, 1916.

LQMMMQ. Patented Jan. 22, 1918.

2 SHEETS-SHEET 2.

zyw y @MV Wm W? Y ing the center of 1,254. elle rlhere are preferably extended through the clamp members 19 and 20, suitable guide rods 26, one of which is shown partly in full and partly in dotted lines in the upper part of Fig. 5, and the other-part is' shown by dotted linesin the lower part of said Fi'g. 5.

In this connection .it may be mentioned that my device is especially adapted for use in cutting keys for tumbler locks such as the well known Yale lock.

At the rear end of the base 10 are upwardly extending bearing members 27 in which the transverse shaft 28 is mounted.

Supported on the shaft Q8 are the arms 29 of a forwardly extending bracket which in the form of the device shown, are connected at their forward ends.

Formed on the forward end of the bracket, just mentioned, are forwardly extending horizontal spaced bearing members 30, in which is rotatably mounted a shaft 31, on one end of which is a crank wheel 32 or other means for imparting rotation to the shaft 31.

In the central portion of the pivoted bracket, now being` described, is mounted a screw 33, which when the bracket is in horizontal position, extends downwardly and is adapted to be manipulated to contact with the base 10 for limitingl the forward movement of said bracket. v

A spring is provided for yieldably supporting the frame member Q9, comprising two spaced coils 34 mounted on the shaft 28.

A U-shaped connecting member is connected with each of the coils 34 and is designed to rest on the basei 10,*as shown in Fig. 4. IThe opposite ends 3G of the respective coils 34 are extended forwardly in the machine and are provided with lateral eX- tensions 37 resting beneath the arms of the frame 29, as shown in Figs. 1 and 4. rlhe par`ts are so arranged that the weight of the frame 29 and the parts carried thereby, when the frame 29 is in horizontal position, will compress the spring and permit the meehanism supported by the forward part of the frame on the shaft 31 to swing downwardly until the screw 33 engages the base 10.

vWhen, however, the frame 29 is tilted upwardly to its position shown by dotted lines in Fig. 4, thereby considerably shiftgravity of said frame., `the spring will hold the frame in its raised position.

A stop 38 limits the upward and rearward swinging movement of the frame 29, Fig. 4.

The shaft 31, when the frai Ae 29 is in ils horizontal position. rests directly over the clamp device hereinbefore described.

On the end of the shaft 31 opposite the crank wheel 32 is a cutting disk or wheel 39.

ounted in the forward portion of the last described pins are frame E29, on which the bearings 30 are formed, is an upright member 40 capable of vertical adjustment and having at its lower end a forwardly extending arm 41 adapted to stand above the clamp members 19 and 20.

A set-screw 42 is mounted in the forward portion of the frame serve for locking the upright member 40 in any of its adjusted positions.

l shall now describe the practical operation of my key cutting machine.

In preparing to cut the notches in a key to make that key fit any particular lock of the tumbler type, I remove the cylinder 43, which carries the tumblers, from the lock. This cylinder has at one end an annular flange 44, as clearly shown in Figs. 7 and 8.

The cylinder 43 has a key hole. Mounted in the wall of the cylinder are a series of tumblers.

In Figs. 7 and 8, are shown three of the tumblers, indicated by the characters 45, 46 and 47. The cylinders 43, which are herein mentioned are of the very common type, which are used in a large per cent of the Yale and Corbin locks of today. These locks are constructed to receive a cylinder such as is shown at 43 being rotatably mounted transversely of the lock. The outer end of the cylinder has the flange 44 thereon and an opening therein adapted to receive a key. The key projects through said opening and into the cylinder, which is provided with a longitudinal Slot,

which receives the notched end of the key and which is made in various Shapes in cross section.

Above the last described slot is a row of equi-distant openings adapted to slidably receive pointed pins 45, 46 and 47. These pins are of such length that when the lower pointed ends have fallen to fit into the adjacent notches of the key, which belongs to that lock, the upper endg of said pins will be flush with the outer Surface of the cylinder as shown in Fig. 8. The lock frame further supports a row of slidably mounted vertical pins, which correspond in diameter and position to the pins 45, 46 and 47. The placed directly above the cylinder 43 and their lower ends are pushed downwardly against the upper lguri'ace of said cylinder by means of Springs or the like. The cylinder 43 is so arranged that when the pins 45, and 47 are directly beneath the second described set of pins the bolt or latch will be in its locked position. It will be seen by referring to liig. 3 that if the key d8 should be withdrawn from the .oca the pins 45, 46 and 47 would be allowed to fall down farther into the key slot in said cylinder. As soon as these pins so fall it will be seen that the pins of the second described row down so that the lower ends of the second 'would immediately fall 29 and is adapted to herein, this cylinderv '1s would @nier w ilpper parat of Son above the kay blank i7 'for cui in which The first, doscl'bef il'st Notch tl'mein. The Crunk *.'vimy in snthe @Cond (inscribed I'o'uied 'for Qu'i y e ope ling in cylinder 473 blank l?, and as tls K Huf, oc; in prva ihe'eby preventing the .vmdly in cutting :1 m )Qing fllzncd :1nd ik@ luch or imo che space bvwem Nia as shmvn in 3.

,m ulg' TIERS su l mal that. n

@Non a key can be Y shm fume, und L of the type which have a rotatable cylinder therein adapted to be secured in locked position by a row of pins mounted to slide into and out of said cylinderhconsistng of first .Y removing said cylinder with its tumbler pins from the lock, then placing :rkey blank in the key hole of the cylinder whereby the tumbler pins will be forced outwardly from the cylinder a distance equal to the depth of the notches in a key adapted to fit the 1C lock, then cutting notches in a second key blank by a cutter controlled in its operation by said tumbler pins as a pattern.

Des Moines, owzt, September 18, 1916.

CHANNING L. SMITH. 

